Rainbow Cake Palette Foam Insert with AdhesiveThe Rainbow Cake Pro Palette Insert holds (8) Rainbow Cake paints securely in a high density easy to clean charcoal colored poly foam. This insert fits into the empty Professional palettes which are sold separately. Important Note: If you purchase a Rainbow Cake Palette a foam insert is already included with the palette, some people prefer to purchase an extra insert as a backup or to replace an older insert.